Need proper documentation of "How do I check my new RAK811 with Realterm"

Hi All,
I have bought new RAK811 and referring your "Getting Started With the
RAK811 LoRa Node V1.0" document but I am unable to get response "OK<version number>". I think the document above is not proper for Realterm. If I am correct please help me out. I am new to this board.

Thank You for your reply,
I tried your solution so many times as it given in document but my RAK811 isn't giving response back.
Sir my worry is, do I need to add extra driver in RAK811 or something else. Tell me from scratch. I have just connected my RAK811 to my PC to check on Realterm after taking out from parcel box.